Make the datashape unification work with identical struct types
Add .py (arbitrary python code) and .npy loading to catalog
PEP8 fixes
Add .npy and .py examples to the samples catalog
Add tests for simple operation of a catalog
Get the server code working with the catalog
Add a test which runs a server and uses RArray
Add flask as a dependency (the server uses it)
Sort the ls function results in blaze.catalog
Fix since subprocess.CREATE_NEW_PROCESS_GROUP is windows-only